The RAM-D-111U consists of a 3.68" diameter round base, STANDARD length double socket arm and 11" x 3" rectangular plate. The round base contains pre-drilled holes, including two holes at 180 degrees and three holes at 120 degrees. The rectangle plate contains different combinations of pre-drilled holes which will match up to many electronic devices and mounts, including Marine GPS, CB Radios, Ham Radios, Gimbal Brackets and more.